[PATCH] Add sysfs battery & speed attributes for wacom bluetooth tablet

Hi,
I need your opinion if reporting battery condition/changing reporting
speed of a bluetooth device through sysfs is an acceptable practice.

[PATCH] Add sysfs battery & speed attributes for wacom bluetooth tablet

The patch creates 2 sysfs attributes:
The battery attribute is read-only and it appears in:
/sys/bus/hid/devices/{btaddr}/battery
/sys/class/bluetooth/hci*:*/{btaddr}/battery
/sys/class/hidraw/hidraw*/device/battery
Capacity values are in %, zero value means AC plug is connected.

The speed attribute allows to poke reporting speed of wacom tablet.
This attribute is RW, valid values are: 5 for low speed, 6 is high
speed. High speed is the default value. Using low speed is
a workaround if you experience big delay between move of stylus on
the tablet and move of cursor on screen.

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Kind regards,
Przemo